CN107546735B - Electrical system for connecting to two power sources and electrical apparatus comprising such an electrical system - Google Patents
Electrical system for connecting to two power sources and electrical apparatus comprising such an electrical system Download PDFInfo
- Publication number
- CN107546735B CN107546735B CN201710513972.4A CN201710513972A CN107546735B CN 107546735 B CN107546735 B CN 107546735B CN 201710513972 A CN201710513972 A CN 201710513972A CN 107546735 B CN107546735 B CN 107546735B
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- Prior art keywords
- voltage
- input terminal
- terminal
- electrical
- positive
- Prior art date
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000005669 field effect Effects 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Direct Current Feeding And Distribution (AREA)
- Electronic Switches (AREA)
Abstract
The electrical system (118) comprises: a first positive input terminal (124) and a first negative input terminal (126), which are intended to be connected to a first voltage (V) 1 ) Is provided (102); a second positive input terminal (128) and a second negative input terminal (130), which are intended to be connected to a voltage having a second voltage (V) 2 ) A second power supply (110); and an electrical device (122) connected on the one hand to the first input terminal (124, 126) and on the other hand to the second input terminal (128, 130). The electrical system (118) further includes: a first switch (138) through which the electrical device (122) is connected to the second positive input terminal (128); and a detection means (142) configured to detect whether a voltage (V) between the second positive input terminal (128) and the second negative input terminal (130) is lower than or equal to a predetermined threshold value, and to command the first switch (138) to open when such a detection event occurs.
Description
Technical Field
The present invention relates to an electrical system intended to be connected to two electrical power sources.
In the following description and claims, the term "terminal" is used to indicate any point of an electrical conductor.
Background
The electrical system disclosed in the prior art comprises:
a first positive input terminal and a first negative input terminal, which are intended to be connected to the positive and negative terminals, respectively, of a first power supply, said first power supply having a first voltage between its positive and negative terminals,
a second positive input terminal and a second negative input terminal, which are intended to be connected to the positive and negative terminals, respectively, of a second power supply having a second voltage between its positive and negative terminals, which second voltage is higher than the first voltage,
an electrical device connected to the first input terminal on the one hand and to the second input terminal on the other hand, the electrical device having an electrically conductive path between the second positive input terminal and the first negative input terminal.
It is known to connect a first power source or a second power source to an electrical device by galvanic isolation. The purpose of galvanic isolation is to isolate the two power supplies, that is, to prevent the current carried by the second power supply from passing through the electrical device and reaching the first power supply.
It is an object of the invention to provide insulation between two power supplies that does not require galvanic isolation.
Disclosure of Invention
To this end, an electrical system is proposed, comprising:
a first positive input terminal and a first negative input terminal, which are intended to be connected to the positive and negative terminals, respectively, of a first power supply, said first power supply having a first voltage between its positive and negative terminals,
a second positive input terminal and a second negative input terminal, which are intended to be connected to the positive and negative terminals, respectively, of a second power supply having a first voltage between its positive and negative terminals, the second supply voltage being higher than the first voltage,
an electrical device connected to the first input terminal on the one hand and to the second input terminal on the other hand, said electrical device having an electrically conductive path between the second positive input terminal and the first negative input terminal,
characterized in that the electrical system further comprises:
a first switch through which the electrical device is connected to the second positive input terminal;
a detection device configured to:
detecting whether a voltage between the second positive input terminal and the second negative input terminal is lower than or equal to a predetermined threshold,
upon occurrence of such a detection event, the first switch is commanded to open.
By virtue of the invention, if an accident occurs on the second power supply side, which causes a voltage drop between the second sound input terminal and the second negative input terminal or even a short circuit, the first switch opens and thus isolates the two power supplies.
Optionally, the predetermined threshold is below 20V, for example zero.
Still optionally, the first switch comprises a metal oxide semiconductor field effect transistor.
Still optionally, the electrical system further comprises a second switch through which the electrical device is connected to a second negative input terminal, and the detection means is configured to command the second switch to open if the voltage between the second positive input terminal and the second negative input terminal is detected to be lower than or equal to the predetermined threshold.
Still optionally, the second switch comprises a metal oxide semiconductor field effect transistor.
Still optionally, the electrical device is configured to measure a second voltage of the second power supply.
Still optionally, the electrical device includes: an interface configured to reduce the second voltage and transmit a signal representative of the second voltage; and a computing device configured to measure the second voltage over time based on a signal representative of the second voltage.
Still optionally, the computing device comprises a microcontroller.
Still optionally, the signal representative of the second voltage is analog, the computing device comprises an analog-to-signal converter configured to digitize the analog signal representative of the second voltage, and the computing device is configured to measure the second voltage over time based on the digitized signal representative of the second voltage.
Still optionally, the electrical system is configured to control the voltage converter.
Drawings
FIG. 1 is a circuit diagram of an electrical device embodying the present invention;
fig. 2 is a circuit diagram of the electrical device of fig. 1 during performance of a first test according to standard LV 148;
fig. 3 is a circuit diagram of the electrical device of fig. 1 during performance of a second test according to standard LV 148.
Detailed Description
Referring to fig. 1, an electrical device 100 embodying the present invention will now be described.
The electrical device 100 includes a first power source 102 having a positive terminal 104 and a negative terminal 106 connected to a first electrical ground 108. The first power supply 102 is configured to have a first voltage V between its positive terminal 104 and its negative terminal 106 1 And in the example is configured to carry a current below 10A.
First voltage V 1 Is a DC voltage, for example between 10V and 20V. In the example, the first voltage has a value of 12V. The first power source 102 includes, for example, a first battery (not shown).
The electrical device 100 alsoA second power supply 110 is included having a positive terminal 112 and a negative terminal 114 connected to a second electrical ground 116. The second power supply 110 is configured to have a second voltage V between its positive terminal 112 and its negative terminal 114 2 And in the example is configured to carry a current above 100A.
Second voltage V 2 Is higher than the first voltage V 1 For example, between 30V and 60V. In the example, the second voltage V 2 Has a value of 48V. The second power supply 110 includes, for example, a second battery (not shown).
The first electrical ground 108 and the second electrical ground 116 may be different and have a non-zero voltage between them or actually connected to each other to form only a single electrical ground.
The electrical device 110 further comprises a system 118 for controlling a voltage converter (not shown), such as an inverter or a DC-DC converter. The voltage converter is for example intended to convert the second voltage V 2 For example to a variable or AC voltage.
The control system 118 first includes a first positive input terminal 124 and a first negative input terminal 126, which first positive input terminal 124 and first negative input terminal 126 are intended to be connected to the positive terminal 104 and negative terminal 106, respectively, of the first power source 102.
The control system 118 further includes a second positive input terminal 128 and a second negative input terminal 130, which second positive input terminal 124 and second negative input terminal 126 are intended to be connected to the positive terminal 112 and negative terminal 114, respectively, of the second power supply 110.
In the example, the control system 118 includes an electronic board 120, also referred to as a printed circuit board, on which the elements of the control system 118 described below are mounted.
The control system 118 comprises a measuring device 122, which measuring device 122 is configured to measure the second voltage V of the second power supply 110 over time 2 And transmits a control signal C to the voltage converter, in particular based on the second voltage V 2 Is transmitted.
The measuring device 122 comprises an interface 132, said interface 132 being connected to the first input terminal 124. 126 for its electrical power supply and is connected to a second input terminal 128, 130 for receiving a second voltage V 2 . The interface 132 is configured to reduce the second voltage V 2 And is therefore configured to transmit an analog signal V relative to the second ground 108 2 ' the analog signal also represents the second voltage V 2 But at a lower level, e.g. than the second voltage V 2 At least twice as low, preferably at least twice as low as the second voltage V 2 Four times lower.
The measuring device 122 further comprises a computing device 134, said computing device 134 being connected to the first input terminals 124, 126 for the electric power supply thereof and to the interface 132 for receiving the analog signal V2'. More precisely, the computing device 134 comprises an analog-to-signal converter 136 configured to receive the analog signal V 2 ' and digitize it. The computing device 134 is configured to measure a second voltage V over time based on the digitized signal V2 2 . The computing device 134 includes, for example, a microcontroller.
The measuring device 122 thus has a conductive path through the interface 312 and/or the computing device 134, which is located between the input terminals 124, 126, 128, 130, and in particular between the second positive input terminal 128 and the first negative input terminal 126.
The control system 118 further comprises a first switch 138, through which first switch 138 the measuring device 122 is connected to the second positive input terminal 128. The first switch 138 includes, for example, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET).
The control system 118 further comprises a second switch 140, by means of which second switch 140 the measuring device 122 is connected to the second negative input terminal 130. The second switch 140 includes, for example, a MOSFET.
The switches 138, 140 are preferably each designed to withstand a voltage of 70V between their terminals in both application directions of the voltage when they are open. The switches 138, 140 are further preferably each designed to allow at most only 1 μa to flow when a voltage of 70V is applied between their terminals.
The control system 118 further comprises a detection device 142, the detection device 142 being connected to the second positive input terminal 128 and the second negative input terminal 130. The detection means 142 is also connected to the first switch 138 and the second switch 140 to control them. The detection means 142 is configured to detect whether the voltage V between the second positive input terminal 128 and the second negative input terminal 130 is lower than or equal to a predetermined threshold value, and upon such detection, command the first switch 138 and the second switch 140 to open. The predetermined threshold is, for example, lower than or equal to 20V, for example, zero.
The operation of the electrical system of fig. 1 during testing of standard LV148 will now be described.
Referring to fig. 2, for the first test of standard LV148, second negative input terminal 130 is disconnected from negative terminal 114 of second power source 110 and from second electrical ground 116.
The potential at the second negative input terminal 130 becomes equal to the potential of the second positive input terminal 128. The detection means 142 thus detect that the voltage V is lower than or equal to the predetermined threshold value and command the first switch 138 and the second switch 140 to open.
Opening the first switch 138 thus prevents current transmitted by the second power supply 110 via its positive terminal 112 from flowing through the measurement device 122 toward the first electrical ground 108.
Referring to fig. 3, for the second test of standard LV148, on the one hand, first input terminals 124, 126 are shorted, and on the other hand, second input terminals 128, 130 are also shorted. Further, the second input terminals 128, 130 and the second input terminals 124, 126 are connected to the positive and negative terminals, respectively, of the test power supply 302 that delivers a DC voltage of 70V.
As a result of the second input terminals 128, 130 being short circuited, the voltage V between them drops to zero. The detection means 142 thus detect that the voltage V is lower than or equal to the predetermined threshold value and command the first switch 138 and the second switch 140 to open.
The open switch thus insulates the first input terminals 124, 126 from the second input terminals 128, 130, such that the test power supply 302 generates a substantially zero current, particularly a current below 1 ua,
the invention is not limited to the embodiments described before, but instead is defined by the following claims. In particular, it will be apparent to those skilled in the art that modifications may be made thereto.
For example, the electrical device 122 may be configured to perform measuring the second voltage V 2 Is different from the function of the other.
Furthermore, the terms used in the claims should not be construed as being limited to the elements of the foregoing embodiments, but rather must be construed to cover all equivalent elements available to those skilled in the art based on their general knowledge.
Reference numerals
100. Electrical apparatus
102. First power supply
104. Positive terminal
106. Negative terminal
108. First electric grounding terminal
110. Second power supply
112. Positive terminal
114. Negative terminal
116. Second electric grounding terminal
118. Control system
120. Electronic board
122. Measuring device
124. First positive input terminal
126. First negative input terminal
128. Second positive input terminal
130. Second negative input terminal
132. Interface
134. Computing device
136. Analog-to-digital converter
138. First switch
140. Second switch
142. Detection device
Claims (7)
1. An electrical system (118), comprising:
a first positive input terminal (124) and a first negative input terminal (126) connected to the positive terminal (104) and the negative terminal (106) of the first power supply (102), respectively, the first power supply (102) having a first voltage (V) between its positive terminal (104) and negative terminal (106) 1 ），
A second positive input terminal (128) and a second negative input terminal (130) connected to the positive terminal (112) and the negative terminal (114) of a second power supply (110), respectively, the second power supply (110) having a second voltage (V) between its positive terminal (112) and negative terminal (114) 2 ) The second voltage (V 2 ) Above the first voltage (V 1 ），
An electrical device (122) connected on the one hand to a first input terminal (124, 126) and on the other hand to a second input terminal (128, 130), the electrical device (122) comprising an interface (132) and a computing device (134), the interface (132) being configured to reduce the second voltage (V 2 ) And transmitting a signal representative of said second voltage (V 2 ) Is a signal (V) 2 '), the computing device (134) being configured to represent the second voltage (V) over time 2 ) Is a signal (V) 2 ') measuring the second voltage (V) 2 ) Represents the second voltage (V 2 ) Is a signal (V) 2 ') is analog, wherein the computing device (134) comprises an analog-to-signal converter (136), the analog-to-signal converter (136) being configured to represent the second voltage (V) 2 ) Analog signal (V) 2 ') digitization, wherein the computing device (134) is configured to represent the second voltage (V) over time 2 ) Is a digitized signal (V) 2 ') measuring the second voltage (V) 2 ) And wherein the electrical device (122) has a conductive path between the second positive input terminal (128) and the first negative input terminal (126) through the interface (132) and/or the computing device (134),
characterized in that the electrical system further comprises:
a first switch (138) through which the electrical device (122) is connected to the second positive input terminal (128),
a second switch (140) through which the electrical device (122) is connected to the second negative input terminal (130),
a detection device (142) configured to:
detecting whether a voltage (V) between the second positive input terminal (128) and the second negative input terminal (130) is lower than or equal to a predetermined threshold,
upon occurrence of such a detection event, the first switch (138) and the second switch (140) are commanded to open.
2. The electrical system (118) of claim 1, wherein the predetermined threshold is below 20V.
3. The electrical system (118) of claim 1, wherein the predetermined threshold is zero.
4. An electrical system (118) according to any of claims 1-3, wherein the first switch (138) comprises a metal oxide semiconductor field effect transistor.
5. The electrical system (118) of any of claims 1-3, wherein the second switch (140) comprises a metal oxide semiconductor field effect transistor.
6. An electrical system (118) according to any of claims 1 to 3, wherein the computing device (134) comprises a microcontroller.
7. An electrical system (118) as claimed in any one of claims 1 to 3, configured to control a voltage converter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1656061A FR3053539B1 (en) | 2016-06-29 | 2016-06-29 | ELECTRICAL SYSTEM FOR CONNECTING WITH TWO ELECTRICAL POWER SUPPLIES AND ELECTRICAL INSTALLATION COMPRISING SUCH AN ELECTRICAL SYSTEM |
| FR1656061 | 2016-06-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107546735A CN107546735A (en) | 2018-01-05 |
| CN107546735B true CN107546735B (en) | 2023-10-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710513972.4A Active CN107546735B (en) | 2016-06-29 | 2017-06-29 | Electrical system for connecting to two power sources and electrical apparatus comprising such an electrical system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3264551B1 (en) |
| CN (1) | CN107546735B (en) |
| FR (1) | FR3053539B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3083187B1 (en) * | 2018-06-28 | 2020-08-21 | Valeo Equip Electr Moteur | ELECTRICAL SYSTEM ESPECIALLY FOR MOTOR VEHICLES |
| FR3098062B1 (en) * | 2019-06-26 | 2021-07-30 | Valeo Equip Electr Moteur | Electronic switch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1983755A (en) * | 2005-12-14 | 2007-06-20 | 伍贻杰 | Secondary battery protector with persistent supply |
| CN101718842A (en) * | 2009-12-11 | 2010-06-02 | 北汽福田汽车股份有限公司 | Monitoring method and monitoring system for touch switch |
| CN103855758A (en) * | 2012-11-28 | 2014-06-11 | 丰田自动车株式会社 | Vehicle power-supply system and control method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2400396B2 (en) * | 1974-01-05 | 1977-05-05 | Ellenberger & Poensgen Gmbh, 8503 Altdorf | SWITCHING DEVICE TO PROTECT A DC CIRCUIT SUPPLIED BY ACCUMULATORS - IN PARTICULAR FOR A MOTOR VEHICLE WITH ELECTRIC DRIVE |
| JPH0530929U (en) * | 1991-09-27 | 1993-04-23 | 東京電気株式会社 | Electronics |
| KR100584324B1 (en) * | 2003-08-22 | 2006-05-26 | 삼성전자주식회사 | Apparatus for controlling power in complex mobile terminal |
| US7329969B2 (en) * | 2003-10-15 | 2008-02-12 | Teac Corporation | Electronic device including interface terminal and power supply cable connected thereto |
| US7768756B2 (en) * | 2007-04-27 | 2010-08-03 | Hewlett-Packard Development Company, L.P. | Leakage current protection circuit |
| CN101752828B (en) * | 2008-12-05 | 2012-07-18 | 鸿富锦精密工业（深圳）有限公司 | Low-voltage protection device |
| TWI473376B (en) * | 2013-01-18 | 2015-02-11 | Delta Electronics Inc | Power supply system and control method thereof |
| CN104102318A (en) * | 2013-04-15 | 2014-10-15 | 鸿富锦精密电子(天津)有限公司 | Power source circuit |
-
2016
- 2016-06-29 FR FR1656061A patent/FR3053539B1/en active Active
-
2017
- 2017-06-27 EP EP17177990.3A patent/EP3264551B1/en active Active
- 2017-06-29 CN CN201710513972.4A patent/CN107546735B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1983755A (en) * | 2005-12-14 | 2007-06-20 | 伍贻杰 | Secondary battery protector with persistent supply |
| CN101718842A (en) * | 2009-12-11 | 2010-06-02 | 北汽福田汽车股份有限公司 | Monitoring method and monitoring system for touch switch |
| CN103855758A (en) * | 2012-11-28 | 2014-06-11 | 丰田自动车株式会社 | Vehicle power-supply system and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3053539B1 (en) | 2018-06-29 |
| EP3264551B1 (en) | 2021-03-24 |
| EP3264551A1 (en) | 2018-01-03 |
| CN107546735A (en) | 2018-01-05 |
| FR3053539A1 (en) | 2018-01-05 |
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